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Plaster Molding silicone rubber

Product No.: C-820 and C-825 

Brand: GuoChuang Silicone 

Hardness: Shore A 20, Shore A 25

Application: Making molds for plaster casting industry, such as plaster cornice, plaster statues, plaster home decor times, etc.

Keyword: plaster molding silicone, silicone rubber for plaster casting, mold making silicone rubber

1. Description

Plaster is an age-old casting media used today for casting statuary, home decor items (e.g., lamps, wall plaques) as well as ornamental moldings and decorative millwork.

GC Silicone manufactures two-component, room temperature curing silicone mold materials that are used widely in the plaster casting industry to create highly detailed plaster parts.

Plaster can be cast repeatedly into silicone molds without release agents. The primary differences between polyurethanes and silicones are the cost (silicones are more expensive than polyurethane) and the range of hardness available within the product lines. For highly detailed and delicate castings, silicone rubbers may be necessary as they are available in softer and more flexible options compared to polyurethanes.

The popular silicone mold rubber is C-820/C-825 for these applications. A tin-cured silicone rubber with a 100A:3B mix ratio; measure with a digital scale.

2. Technical Datasheet

Typical general characteristics Inspection MethodValue
Product data (Catalyzed A+B)
HardnessShore A20±225±2
Mix RatioA:B100:3100:3
Pot life25 °C (77F)30-40mins30-40mins
Curing time25 °C (77F)3-4 hours3-4 hours
Mixed viscositymPa.s16000±100020000±1000

Note: This is a 100A:3B mix ratio product that must be measured by weight. The choosing of suitable hardness should be according to the size and pattern design of the products. If large products and therefore multiple-piece molds are needed by customers, silicone rubber with higher hardness will be required for the molds. Conversely, soft silicon is indispensable for molds with complicated pattern and delicate details. The amount of curing agent admixture depends on the actual need of customers. More will be added for speedy drying and fast release and less when otherwise.

Plaster Ornamentation Molding silicone


Making molds for


-home decor items,e.g., lamps, wall plaques

-plaster cornice, decorative millwork


1.Low viscosity

2.Extra low shrinkage

3.Pouring and brushable silicone

4.High tear strength

5.various color is available

6.High reproduction rate


When stored at or below 32°C (89.6°F) in the original unopened containers, C-8 series Silicone Base and its Curing Agents have a usable life of I0 months.


Silicone base:1kg/drum; 20kg/drum;25kg/drum;200kg/drum.

Curing Agent: 30g/bottle; 1kg/bottle

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